

   
\begin{tikzpicture}[scale=2.54]
% dpic version 2012.02.12 option -g for TikZ and PGF 1.01
\ifx\dpiclw\undefined\newdimen\dpiclw\fi
\global\def\dpicdraw{\draw[line width=\dpiclw]}
\global\def\dpicstop{;}
\dpiclw=0.8bp
\dpiclw=0.8bp
\dpicdraw (0,0)
 --(0,0.375)\dpicstop
\dpicdraw (0,0.5) circle (0.049213in)\dpicstop
\dpicdraw (-0.083333,0.5)
 ..controls (-0.083333,0.523012) and (-0.064679,0.541667)
 ..(-0.041667,0.541667)
 ..controls (-0.018655,0.541667) and (0,0.523012)
 ..(0,0.5)\dpicstop
\dpicdraw (0,0.5)
 ..controls (0,0.476988) and (0.018655,0.458333)
 ..(0.041667,0.458333)
 ..controls (0.064679,0.458333) and (0.083333,0.476988)
 ..(0.083333,0.5)\dpicstop
\dpicdraw (0,0.625)
 --(0,1)\dpicstop
\draw (-0.125,0.5) node[left=-1.5bp]{$ v_{s}$};
\dpicdraw (0,1)
 --(0.375,1)
 --(0.395833,1.041667)
 --(0.4375,0.958333)
 --(0.479167,1.041667)
 --(0.520833,0.958333)
 --(0.5625,1.041667)
 --(0.604167,0.958333)
 --(0.625,1)
 --(1,1)\dpicstop
\draw (0.5,0.958333) node[below=-1.5bp]{$ R_{s}$};
\dpicdraw (1,1)
 --(1,0.625)
 --(1.041667,0.604167)
 --(0.958333,0.5625)
 --(1.041667,0.520833)
 --(0.958333,0.479167)
 --(1.041667,0.4375)
 --(0.958333,0.395833)
 --(1,0.375)
 --(1,0)\dpicstop
\draw (1.041667,0.5) node[right=-1.5bp]{$ R_{G}$};
\dpicdraw (1,1)
 --(1.3,1)\dpicstop
\dpicdraw (1.65,0.85)
 --(1.65,1)
 --(1.63893,1)\dpicstop
\dpicdraw (1.65,1.35)
 --(1.65,1.2)
 --(1.63893,1.2)\dpicstop
\dpicdraw (1.65,1.1)
 --(1.475,1.1)\dpicstop
\dpicdraw (1.604167,1.1)
 --(1.604167,1.1)\dpicstop
\filldraw[line width=0bp](1.604167,1.127778)
 --(1.520833,1.1)
 --(1.604167,1.072222) --cycle
\dpicstop
\dpicdraw (1.65,1.2)
 --(1.475,1.2)\dpicstop
\dpicdraw (1.475,0.975)
 --(1.475,1.05)\dpicstop
\dpicdraw (1.475,1.075)
 --(1.475,1.125)\dpicstop
\dpicdraw (1.475,1.15)
 --(1.475,1.225)\dpicstop
\dpicdraw (1.425,1.2)
 --(1.425,1)
 --(1.3,1)\dpicstop
\dpicdraw (1.63893,1.1)
 --(1.65,1.1)
 --(1.65,1)
 --(1.63893,1)\dpicstop
\dpicdraw (1.65,1)
 --(1.475,1)\dpicstop
\dpicdraw (1.65,0.85)
 --(1.65,0.05)\dpicstop
\dpicdraw (1.65,0.05)
 --(1.65,-0.075)\dpicstop
\dpicdraw (1.733333,-0.075)
 --(1.566667,-0.075)\dpicstop
\dpicdraw (1.705556,-0.10625)
 --(1.594444,-0.10625)\dpicstop
\dpicdraw (1.685714,-0.1375)
 --(1.614286,-0.1375)\dpicstop
\dpicdraw (1.65,1.35)
 --(1.65,1.45)\dpicstop
\dpicdraw (1.65,1.45)
 --(2.4,1.45)\dpicstop
\dpicdraw (2.4,1.45)
 --(2.4,0.85)
 --(2.441667,0.829167)
 --(2.358333,0.7875)
 --(2.441667,0.745833)
 --(2.358333,0.704167)
 --(2.441667,0.6625)
 --(2.358333,0.620833)
 --(2.4,0.6)
 --(2.4,0)\dpicstop
\draw (2.441667,0.725) node[right=-1.5bp]{$ R_{D}$};
\dpicdraw (2.4,1.45)
 --(3.1,1.45)\dpicstop
\dpicdraw (3.1,1.45)
 --(3.1,0.85)
 --(3.141667,0.829167)
 --(3.058333,0.7875)
 --(3.141667,0.745833)
 --(3.058333,0.704167)
 --(3.141667,0.6625)
 --(3.058333,0.620833)
 --(3.1,0.6)
 --(3.1,0)\dpicstop
\draw (3.141667,0.725) node[right=-1.5bp]{$ R_{L}$};
\dpicdraw (3.1,0)
 --(0,0)\dpicstop
\end{tikzpicture}


